JUC并发编程与源码分析

public synchronized void start() {  
    /**  
     * This method is not invoked for the main method thread or "system"     * group threads created/set up by the VM. Any new functionality added     * to this method in the future may have to also be added to the VM.     *     * A zero status value corresponds to state "NEW".     */    if (threadStatus != 0)  
        throw new IllegalThreadStateException();  
  
    /* Notify the group that this thread is about to be started  
     * so that it can be added to the group's list of threads     * and the group's unstarted count can be decremented. */    group.add(this);  
  
    boolean started = false;  
    try {  
        start0();  
        started = true;  
    } finally {  
        try {  
            if (!started) {  
                group.threadStartFailed(this);  
            }  
        } catch (Throwable ignore) {  
            /* do nothing. If start0 threw a Throwable then  
              it will be passed up the call stack */        }  
    }  
}  
  
private native void start0();